Abstract:
:Some missense changes are compatible with normal protein function while others compromise essential aspects of protein maturation, specific activity, or stability. For those missense changes that alter function in the intact organism, how likely is it for the mutated protein to retain appreciable residual activity? By genetic analysis of patients with hemophilia B of known severity, this question can be addressed for missense mutations that reduce factor IX activity by fourfold or more below the average. We estimate that missense changes cause only 59% of moderate and severe disease, but these mutations are almost always (95%) of independent origin. In contrast, missense mutations are found in virtually all (97%) families with mild disease, but only a minority of these (41%) are of independent origin. From the aggregate data, we estimate that most (71%) of the independent deleterious missense mutations cause at least a 20-fold decrease in factor IX activity.
journal_name
Hum Genetjournal_title
Human geneticsauthors
Sommer SS,Bowie EJ,Ketterling RP,Bottema CDdoi
10.1007/BF00220543keywords:
subject
Has Abstractpub_date
1992-05-01 00:00:00pages
295-7issue
3eissn
0340-6717issn
1432-1203journal_volume
89pub_type
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